Var
 S:String;

Function Test(St:String):Boolean;
Var
 Sx:String;
 W:Array[1..100] of String;
 Nw,i:Byte;
 b:boolean;
begin
 Sx:=St;
 Nw:=1;
 i:=0;
 W[Nw]:='';
 Repeat
  Inc(i);
  If (Sx[i]<>' ') and (i<=Length(Sx)) then
   W[Nw]:=W[Nw]+Sx[i]
  else
  If Sx[i]=' ' then
   begin
    repeat
     Inc(i);
    until Sx[i]<>' ';
    Dec(i);
    Inc(Nw);
    W[Nw]:='';
   end;
 Until i>Length(Sx);
 b:=false;
 i:=Nw;
 Repeat
  Dec(i);
  if W[i]=W[Nw] then b:=true;
 Until b or (i=1);
 Test:=b;
end;

Begin
 Writeln('Enter the string:');
 Readln(S);
 Writeln(Test(S));
 Readln;
End.

Var
 S:String;
 W:Array[1..100] of String;
 Nw,i:Byte;

Begin
 Writeln('Enter the string:');
 Readln(S);
 Nw:=1;
 i:=0;
 W[Nw]:='';
 Repeat
  Inc(i);
  If (S[i]<>' ') and (i<=Length(S)) then
   W[Nw]:=W[Nw]+S[i]
  else
  If S[i]=' ' then
   begin
    repeat
     Inc(i);
    until S[i]<>' ';
    Dec(i);
    Inc(Nw);
    W[Nw]:='';
   end;
 Until i>Length(S);
 For i:=1 to Nw do
  Write(W[i][Length(W[i])]);
 Readln;
End.

Const
 N=20;
Type
 Vector=Array[1..N] of Integer;
Var
 a:Vector;
 k:Integer;

Function Dif(b:Vector):Integer;
Var
 df,i,j:Integer;
begin
 df:=10000;
 For i:=1 to N-1 do
  For j:=i+1 to N do
   If Abs(b[i]-b[j])<df then df:=Abs(b[i]-b[j]);
 Dif:=df;
end;

Begin
 Randomize;
 For k:=1 to N do
  begin
   a[k]:=random(100);
   write(a[k]:4);
  end;
 Writeln;
 Writeln;
 Writeln('Result: ',Dif(a));
 Readln;
End.

Const
 N=20;
Type
 Vector=Array[1..N] of Integer;
Var
 a:Vector;
 i:Integer;
 Sum:Real;

Begin
 Randomize;
 For i:=1 to N do
  begin
   a[i]:=random(100);
   write(a[i]:4);
  end;
 Writeln;
 Writeln;
 Sum:=0;
 for i:=1 to (N div 2) do Sum:=Sum+Sqr(a[2*i-1]);
 Writeln('Result: ',Sum:0:0);
 Readln;
End.